OBStruct

一个简单、纯粹、极速的二进制解析库

✨ 亮点

纯 Python，零依赖，开箱即用
基于类型注解 声明字段，简洁直观
支持 struct 标准库全部格式，额外支持 array 类型
AOT 编译加速，高性能解析
完整的操作支持：打包、解包、流式处理、偏移读写

📊 基准测试

测试环境：12th Gen Intel® Core™ i7-12700H | 12 个基本类型字段 | 64,000 次操作/方法

操作	单次耗时	相对 Pack
Pack	216.8 ns	1.00x
Update From	318.2 ns	1.47x
Update	329.3 ns	1.52x
Unpack From	628.5 ns	2.90x
Unpack	679.0 ns	3.13x

📄 详细报告：BENCHMARK_TEST-v0.6.0.md

🚀 v0.6.0 更新亮点

✅ 性能大幅提升

Pack 系列全面优化，尤其是 复杂结构体 和 数组字段
Complex Pack 性能提升 67.4%
Complex Iter Update（批量更新）性能提升 36.0%

⚠️ 已知回退

Unpack 系列存在不同程度的性能倒退（相较 v0.5.0）：

Unpack：+12.8%
Unpack From：+25.3%
Complex Unpack From：+21.9%

如果你的场景以 Pack / Update 为主，升级将获得显著收益；若以 Unpack 为主，建议评估后升级。

📦 安装

pip install obstruct

使用 uv 或 poetry 等工具时按对应方式安装即可。

🧩 快速开始

声明一个 Struct 类型——它同时是一个 dataclass：

from dataclasses import dataclass

import obstruct as obs


@dataclass(slots=True)  # slots=True 提升性能
class MyStruct(obs.Struct):
    a: int
    b: float
    c: obs.long
    d: obs.unsigned_short


if __name__ == "__main__":
    data = MyStruct(a=0, b=2.0, c=10000, d=14545)

    # 打包
    packed = data.pack()
    print(packed)  # bytes

    # 解包
    restored = MyStruct.unpack(packed)
    print(restored)

    # 注意：浮点数精度可能导致 data != restored

📖 支持的类型

继承自 struct 标准库的所有格式，并扩展了 array 类型：

类型	说明
`int` / `unsigned_int`	标准整型
`long` / `unsigned_long`	长整型
`short` / `unsigned_short`	短整型
`float` / `double`	浮点数
`char` / `string`	字符/字符串
`array`	数组（⚠️ 建议传入 `array` 模块对象，避免 Python 序列）
`bool`	布尔值

🧠 推荐使用方式

场景	推荐方法	理由
高频单次打包	`pack`	最快基准操作
高频单次解析（复用对象）	`update_from`	最快解析方法，复用 + 偏移
需要新建对象	`unpack_from`	比 `unpack` 快 7.4%
批量处理	`iter_update`	每元素仅 270 ns
复杂结构批量解析	`complex_iter_update`	比解包版本快 56.4%
极致性能	手动 `memoryview` + `struct.unpack_from`	完全控制，零拷贝

🗺️ 路线图

简化 API：移除繁琐装饰器，统一为 Struct 基类
持续性能优化：进一步缩小 Unpack 路径的性能差距
类型存根优化：重新评估类型提示的强制方式
Tag 联合类型：对标 msgspec 的联合体支持

📄 许可证

项目使用 BSD 3-Clause 许可证，全文参见 LICENSE

🙏 致谢

本项目源自 HydrogenLib 的 Objective-Struct 模块，现已独立维护。

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